Dead External Hard Drive

A few months ago my external hard drive stopped working. At first the power light would come on but the hard drive wouldn't boot up. I think I may have plugged the wrong wattage from another cord mistakenly into it and from that point on, the power light stopped coming on. I decided to get a new printed circuit board from a reputable data recovery company in Canada. In addition to purchasing the PCB from them, they advise that the old/dead PCB be sent to them so they can swap the BIOS info from the old one onto the new one for better compatibility. The company claims they never received my old PCB (I tracked it and it shows delivered).

Is there any way I would still be able to recover my data from my external hard drive since I no longer have the old PCB?"